Precision spectroscopy of light exotic atoms

Gotta, D.

doi:10.1016/j.ppnp.2003.09.003

Cited by 121 publications

(98 citation statements)

References 129 publications

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“…Table 8 in Ref. [27]. On the other hand, this averaged value differs significantly from the scattering length in the 11 S 0 partial wave -which is one of the possible final states in the decay J/Ψ→γpp.…”

Section: Proton-antiproton Scattering At Low Energiesmentioning

confidence: 87%

Near threshold enhancement of thepp¯mass spectrum inJ/Ψdecay

et al. 2005

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We investigate the nature of the near-threshold enhancement in the pp invariant mass spectrum of the reaction J/Ψ→γpp reported recently by the BES Collaboration. Using the Jülich NN model we show that the mass dependence of the pp spectrum close to the threshold can be reproduced by the S-wave pp final state interaction in the isospin I=1 state within the Watson-Migdal approach. However, because of our poor knowledge of the NN interaction near threshold and of the J/Ψ→γpp reaction mechanism and in view of the controversal situation in the decay J/Ψ→π 0 pp, where no obvious signs of a pp final state interaction are seen, explanations other than final state interactions cannot be ruled out at the present stage.

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Section: Proton-antiproton Scattering At Low Energiesmentioning

confidence: 87%

Near threshold enhancement of thepp¯mass spectrum inJ/Ψdecay

et al. 2005

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“…The WM approach was developed in the study of the meson production process in NN collision [22], in which case, it involves large scattering lengths, e.g., for np scattering, a np ≈ −24 fm. However, for the NN case, the scattering length is an order of 1 fm, suggested by the experimental measurements of the level shifts and widths for antiprotonic hydrogen atoms [36]. In addition, due to the annihilation effects, the scattering length becomes a complex number, and it is not clear how WM approximation works in the NN sector.…”

Section: Historical Development: Working With Effective Range Expansionmentioning

confidence: 99%

“…[35] is not pointed out. In fact, the pp S-wave scattering length has been calculated comprehensively by theoretical calculation and also by the experimental information, i.e., measurement of the protonium level shifts [36]. For a comparison, the scattering length for 1 S 0 partial wave is organized in Table 1 for the different pp interactions used for treatment of J/ψ → γpp in this paper.…”

Section: Updates: More Refined Treatment Of Interaction and Fsimentioning

confidence: 99%

Status of X(1835) and pp¯ Interaction from Chiral Symmetry

Liu

Kang

2016

Symmetry

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Abstract:After the observation of the strong near-threshold enhancement of proton-antiproton mass spectrum in J/ψ → γpp decay, lots of theoretical investigations have been available such as new resonance, the final-state pp interaction (FSI), pp bound state (or baryonium), glueball, or other exotic (tetra-quark) states. Here, we provide a short review on the current status, especially on the pertinent discussions concerning its relation to pp interaction, for which the emphasis is put on the recently constructed chiral potential.

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“…The crystal spectrometer is set up in Johann geometry [39] and has been specifically designed for high-accuracy X-ray spectroscopy of light exotic atoms [40,41] and was initially used for antiprotonic hydrogen and deuterium spectroscopy at LEAR [20]. The Johann configuration allows the simultaneous measurement of two different energies.…”

Section: X-ray Spectrometer and Data Acquisitionmentioning

confidence: 99%

Measurement of the charged pion mass using a low-density target of light atoms

et al. 2016

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Abstract. We present a new evaluation of the negatively charged pion mass based on the simultaneous spectroscopy of pionic nitrogen and muonic oxygen transitions using a gaseous target composed by a N 2 /O 2 mixture at 1.4 bar. We present the experimental set-up and the methods for deriving the pion mass value from the spatial separation from the 5g − 4 f πN transition line and the 5g − 4 f μO transition line used as reference. Moreover, we discuss the importance to use dilute targets in order to minimize the influence of additional spectral lines from the presence of remaining electrons during the radiative emission. The occurrence of possible satellite lines is investigated via hypothesis testing methods using the Bayes factor.

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Precision spectroscopy of light exotic atoms

Cited by 121 publications

References 129 publications

Near threshold enhancement of thepp¯mass spectrum inJ/Ψdecay

Near threshold enhancement of thepp¯mass spectrum inJ/Ψdecay

Status of X(1835) and pp¯ Interaction from Chiral Symmetry

Measurement of the charged pion mass using a low-density target of light atoms

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